US4476039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stain-resistant ruthenium oxide-based resistors
Assignee: EIDP Inc
•
Filing: 1983-01-21
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Granted: 1984-10-09
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Expires: 2003-01-21
Abstract
Abstract Stain-free printable thick film resistor compositions comprising finely divided particles of (a) ruthenium oxide-based compound, (b) a thermally decomposable oxygen-containing compound of a nonalkali metal and (c) inorganic binder, all dispersed in (d) an organic medium.
Inventors
- 👤 Jacob Hormadaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:44
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/07; C03C3/072; C03C3/074; C03C3/076; C03C3/102; C03C3/108; C03C8/00; C03C8/02; C03C8/10; C03C8/14; C03C8/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A printable thick film resistor composition consisting essentially of an admixture of finely divided particles of: (a) 5-75% wt. a ruthenium oxide-based compound; (b) 5-50% wt. an oxygen-containing nonalkali metal compound which is thermally stable below 150° C. but which will decompose with the release of oxygen therefrom upon air firing of the composition at 150°-1200° C., the mole ratio of (a) to (b) being at least 0.1; and (c) 5-20% wt. inorganic binder, dispersed in (d) 5-45% wt. organic medium.
Claim 2
Dependent Claim
81 words
A printable thick film resistor composition consisting essentially of an admixture of finely divided particles of: (a) 5-75% wt. a ruthenium oxide-based compound; (b) 5-50% wt. an oxygen-containing nonalkali metal compound which is thermally stable below 150° C. but which will decompose with the release of oxygen therefrom upon air firing of the composition at 150°-1200° C., the mole ratio of (a) to (b) being at least 0.1; and (c) 5-20% wt. inorganic binder, dispersed in (d) 5-45% wt. organic medium.
Claim 3
Dependent Claim
15 words
The composition of claim 1 in which (a) is 10-60% by weight of the composition.
Claim 4
Dependent Claim
15 words
The composition of claim 1 in which (b) is 10-40% by weight of the composition.
Claim 5
Dependent Claim
15 words
The composition of claim 1 in which (b) is 15-30% by weight of the composition.
Claim 6
Dependent Claim
28 words
The composition of claim 1 in which (a) is selected from the group consisting of RuO 2 , ruthenium-containing pyrochlores, precursors of RuO 2 , and mixtures thereof.
Claim 7
Dependent Claim
26 words
The composition of claim 1 in which (b) is selected from the group consisting of oxides, chromates, nitrates and permanganates of nonalkali metals and mixtures thereof.
Claim 8
Dependent Claim
12 words
The composition of claim 6 in which (b) is Ag 2 O.
Claim 9
Dependent Claim
12 words
The composition of claim 6 in which (b) is CoCrO 4 .
Claim 10
Dependent Claim
23 words
The composition of claim 1 in which (c) is selected from the group consisting of lead-containing glasses, lead-free manganese-containing glasses and mixtures thereof.
Claim 11
Dependent Claim
54 words
A resistor comprising a patterned thin layer of the dispersion of the compositions of any of claims 1-9 or mixtures thereof which has been dried and fired in an oxidizing atmosphere to effect thermal decomposition of the oxygen-containing nonalkali metal compound, volatilization of the organic medium and liquid phase sintering of the inorganic binder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |